Selfmates with active white king 8

One of the initial motivations for announcement of 13th TT CCM were the discoveries of the orthodox selfmates with the white Rex Solus (s#2 by Gustav von Brocker & Wilhelm Cohn, s#2 by Ottó Titusz Bláthy, s#2 by Enzo Minerva). They are rare, however in fairy chess there are many possibilities allowing control of the situation by the lonely white king. You can find below some of them, and not surprisingly, Maximummer condition is the most frequently used device.
Albert H. Kniest
Schachmatt 1947

1.Kf5! g5 2.Kf6 Qh7 3.Kxg5 Qb1 4.Kh6 Qg6#

As is already written above, Maximummer condition is the most common way to manage black actions. Here it is supplemented by Checkless chess excluding some longer moves that would be non-mating checks.

s#4 (1+4)
Checkless chess, Maximummer

Neal Turner
Turku 1995


1.Kb6[Id1]! Qc8[Id8] 2.Kb5[Id7] Qc2[Id1] 3.Ka5[Ic1] Qc8[Ic7] 4.Kb6[Id8] Qc1[Id1] 5.Ka7[Ic2] Qc7[Ic8]#

There is a forced set mate, but White cannot keep it. Thus he makes a short way with his king that loses one move, while it keeps the black Queen oscillating on the c-file.

s#5 (1+2+1)
Maximummer, imitator c2

Roméo Bedoni
3729 Phénix 95 - April 2001

1.Kh2! e1CA+ 2.Kg2 d1CA+ 3.Kf2 c1CA+ 4.Ke2 b1CA+ 5.Kd2 a1CA+ 6.Kc2 CAb5+ 7.Kxb1 CAc4+ 8.Kxa1 CAb4#

White forces 5 camel promotions and then ends mated by 4 camels forming a square. Nice find, it uses the other relatively usual device allowing Rex Solus selfmates, Ultraschachzwang, requiring checking by every black move.

s#8 (1+7)
Ultraschachzwang, camel a8

Albert H. Kniest
Frankfurter Notizen 1963

1.Kg6! LIa2 2.Kf7 LIg8 3.Ke8 LIa8 4.Kd7 LIa1 5.Kc6 LIa8 6.Kb5 LIa1 7.Ka4 LIa6 8.Ka3 LIa1 9.Ka2 LIa6 10.Ka1 LIa8#

There are many ways to a1 for the wK, but he must take care of a bLI Black lion must be forced to oscillate on the a-file.

s#10 (1+3)
Maximummer, lion h2

Peter Kniest
9787 Feenschach 820 - 1970

1.Ke6! d5 2.Ke5 e6 3.Kd4 e5+ 4.Kc5 d4 5.Kc4 c5 6.Kd3 c4+ 7.Ke4 d3 8.Ke3 e4 9.Kd2 e3+ 10.Kc3 d2 11.Kc2 c3 12.Kd1 c2#

And this is the third fairy condition sometimes udes for white Rex Solus selfmates. White king makes systemical movement controlling the actions of black pawns ending in a model mate. There is a choice in the beginning, it is necessary think about finale already in the first move. 1.Kc6? would end on the wrong side.

s#12 (1+5)

Gerhard Pfeiffer
Problemkiste 130 - August 2000

1.Kb1! CHh2(S) 2.Kc1 CHf1(B) 3.Kd2 CHh3(R) 4.Ke3 CHh8(Q) 5.Kf4 CHa1(S) 6.Kxg4 CHc2(B) 7.Kf4 CHh7(R) 8.Ke3 CHa7(Q)+ 9.Kd2 CHg1(S) 10.Kc1 CHh3(B) 11.Kb1 CHc8(R) 12.Ka1 CHc1(Q)#

And finally again Maximummer, but very well pointed. White kings makes a trip there and back (Hobbit :-)) just to open one line for continuosly transforming black chameleon.

s#12 (1+6)
Maximummer, chameleon (queen) b8

Comments to Juraj Lörinc.
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